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  <a name="ZH-CN_TOPIC_0000001832001492"></a><a name="ZH-CN_TOPIC_0000001832001492"></a>
  <h1 class="topictitle1">功能概览</h1>
  <div>
   <div class="section">
    <h4 class="sectiontitle">备份</h4>
    <ul>
     <li>全量备份：备份资源当前时间点的所有数据。</li>
     <li><span id="ZH-CN_TOPIC_0000001832001492__zh-cn_topic_0000001862053249_ph0724454151718">永久增量（合成全量）备份：当不存在全量副本时，首次<span id="ZH-CN_TOPIC_0000001832001492__zh-cn_topic_0000001862053249_text11876739133719">永久增量（合成全量）备份</span>将执行全量备份，后续每次备份均为增量备份。永久增量（合成全量）备份产生的副本为永久增量（合成全量）副本，可提升恢复性能，且不占用额外空间。</span></li>
     <li>源端重删：开启源端重删可以减少传输的数据量，但会增加客户端的资源占用。</li>
     <li>传输和存储加密：<span>使用AES256加密算法对备份数据进行加密。</span></li>
    </ul>
   </div>
   <div class="section">
    <h4 class="sectiontitle">复制</h4>
    <ul id="ZH-CN_TOPIC_0000001832001492__zh-cn_topic_0000001862053249_ul1627759153116">
     <li id="ZH-CN_TOPIC_0000001832001492__zh-cn_topic_0000001862053249_li816915753113">备份副本复制：将备份副本从源端复制到目标端，在本地数据中心发生灾难时，通过复制副本恢复业务数据。</li>
    </ul>
   </div>
   <div class="section">
    <h4 class="sectiontitle">恢复</h4>
    <ul id="ZH-CN_TOPIC_0000001832001492__zh-cn_topic_0000001862053249_ul691518483322">
     <li id="ZH-CN_TOPIC_0000001832001492__zh-cn_topic_0000001862053249_li18600174653218">恢复副本至原位置或新位置：支持使用备份副本、复制副本（不支持恢复至原位置）进行恢复。</li>
    </ul>
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     <strong>父主题：</strong> <a href="zh-cn_topic_0000001878840661.html">概述</a>
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